chore: use globalThis over global everywhere

.eslintrc.js

@@ -13,8 +13,8 @@ const internalPackages = getPackages()
 
 module.exports = {
   env: {
+    es2020: true,
     'jest/globals': true,
-    node: true,
   },
   extends: [
     'plugin:markdown/recommended',
@@ -23,7 +23,7 @@ module.exports = {
     'plugin:prettier/recommended',
   ],
   globals: {
-    BigInt: 'readonly',
+    console: 'readonly',
   },
   overrides: [
     {
@@ -41,7 +41,7 @@ module.exports = {
           {argsIgnorePattern: '^_'},
         ],
         '@typescript-eslint/prefer-ts-expect-error': 'error',
-        // TS verifies this
+        // TS verifies these
         'consistent-return': 'off',
         'no-dupe-class-members': 'off',
         'no-unused-vars': 'off',
@@ -166,6 +166,7 @@ module.exports = {
       rules: {
         'import/order': 'off',
         'import/sort-keys': 'off',
+        'no-restricted-globals': ['off'],
         'sort-keys': 'off',
       },
     },
@@ -228,9 +229,9 @@ module.exports = {
         'e2e/jasmine-async/__tests__/*',
       ],
       globals: {
-        fail: true,
-        jasmine: true,
-        pending: true,
+        fail: 'readonly',
+        jasmine: 'readonly',
+        pending: 'readonly',
       },
     },
     {
@@ -252,6 +253,10 @@ module.exports = {
         'jest/valid-expect': 'off',
       },
     },
+    {
+      env: {node: true},
+      files: ['*.js', '*.jsx'],
+    },
     {
       files: [
         'scripts/*',
@@ -431,6 +436,13 @@ module.exports = {
     'no-prototype-builtins': 'error',
     'no-redeclare': 'warn',
     'no-regex-spaces': 'warn',
+    'no-restricted-globals': [
+      'error',
+      {
+        message: 'Use `globalThis` instead.',
+        name: 'global',
+      },
+    ],
     'no-restricted-imports': [
       'error',
       {message: 'Please use graceful-fs instead.', name: 'fs'},

CHANGELOG.md

@@ -35,6 +35,7 @@
 - `[*]` [**BREAKING**] Drop support for Node v10 and v15 and target first LTS `16.13.0` ([#12220](https://github.com/facebook/jest/pull/12220))
 - `[*]` [**BREAKING**] Drop support for `typescript@3.8`, minimum version is now `4.2` ([#11142](https://github.com/facebook/jest/pull/11142))
 - `[*]` Bundle all `.d.ts` files into a single `index.d.ts` per module ([#12345](https://github.com/facebook/jest/pull/12345))
+- `[*]` Use `globalThis` instead of `global` ([#12447](https://github.com/facebook/jest/pull/12447))
 - `[docs]` Add note about not mixing `done()` with Promises ([#11077](https://github.com/facebook/jest/pull/11077))
 - `[docs, examples]` Update React examples to match with the new React guidelines for code examples ([#12217](https://github.com/facebook/jest/pull/12217))
 - `[expect]` [**BREAKING**] Remove support for importing `build/utils` ([#12323](https://github.com/facebook/jest/pull/12323))

docs/Configuration.md

@@ -463,13 +463,13 @@ Example:
 module.exports = async () => {
   // ...
   // Set reference to mongod in order to close the server during teardown.
-  global.__MONGOD__ = mongod;
+  globalThis.__MONGOD__ = mongod;
 };
 ```
 
 ```js title="teardown.js"
 module.exports = async function () {
-  await global.__MONGOD__.stop();
+  await globalThis.__MONGOD__.stop();
 };
 ```
 
@@ -1151,7 +1151,7 @@ module.exports = CustomEnvironment;
 let someGlobalObject;
 
 beforeAll(() => {
-  someGlobalObject = global.someGlobalObject;
+  someGlobalObject = globalThis.someGlobalObject;
 });
 ```
 

docs/MongoDB.md

@@ -33,10 +33,10 @@ describe('insert', () => {
   let db;
 
   beforeAll(async () => {
-    connection = await MongoClient.connect(global.__MONGO_URI__, {
+    connection = await MongoClient.connect(globalThis.__MONGO_URI__, {
       useNewUrlParser: true,
     });
-    db = await connection.db(global.__MONGO_DB_NAME__);
+    db = await connection.db(globalThis.__MONGO_DB_NAME__);
   });
 
   afterAll(async () => {

docs/Puppeteer.md

@@ -65,7 +65,7 @@ module.exports = async function () {
   const browser = await puppeteer.launch();
   // store the browser instance so we can teardown it later
   // this global is only available in the teardown but not in TestEnvironments
-  global.__BROWSER_GLOBAL__ = browser;
+  globalThis.__BROWSER_GLOBAL__ = browser;
 
   // use the file system to expose the wsEndpoint for TestEnvironments
   await mkdir(DIR, {recursive: true});
@@ -125,7 +125,7 @@ const path = require('path');
 const DIR = path.join(os.tmpdir(), 'jest_puppeteer_global_setup');
 module.exports = async function () {
   // close the browser instance
-  await global.__BROWSER_GLOBAL__.close();
+  await globalThis.__BROWSER_GLOBAL__.close();
 
   // clean-up the wsEndpoint file
   await fs.rm(DIR, {recursive: true, force: true});
@@ -142,7 +142,7 @@ describe(
   () => {
     let page;
     beforeAll(async () => {
-      page = await global.__BROWSER_GLOBAL__.newPage();
+      page = await globalThis.__BROWSER_GLOBAL__.newPage();
       await page.goto('https://google.com');
     }, timeout);
 

docs/Troubleshooting.md

@@ -140,7 +140,7 @@ If a promise doesn't resolve at all, this error might be thrown:
 - Error: Timeout - Async callback was not invoked within timeout specified by jasmine.DEFAULT_TIMEOUT_INTERVAL.`
 ```
 
-Most commonly this is being caused by conflicting Promise implementations. Consider replacing the global promise implementation with your own, for example `global.Promise = jest.requireActual('promise');` and/or consolidate the used Promise libraries to a single one.
+Most commonly this is being caused by conflicting Promise implementations. Consider replacing the global promise implementation with your own, for example `globalThis.Promise = jest.requireActual('promise');` and/or consolidate the used Promise libraries to a single one.
 
 If your test is long running, you may want to consider to increase the timeout by calling `jest.setTimeout`
 

e2e/__tests__/__snapshots__/circusDeclarationErrors.test.ts.snap

@@ -16,7 +16,7 @@ exports[`defining tests and hooks asynchronously throws 1`] = `
       14 |   });
       15 | });
 
-      at eventHandler (../../packages/jest-circus/build/eventHandler.js:190:11)
+      at eventHandler (../../packages/jest-circus/build/eventHandler.js:146:11)
       at test (__tests__/asyncDefinition.test.js:12:5)
 
   ● Test suite failed to run
@@ -31,7 +31,7 @@ exports[`defining tests and hooks asynchronously throws 1`] = `
       15 | });
       16 |
 
-      at eventHandler (../../packages/jest-circus/build/eventHandler.js:158:11)
+      at eventHandler (../../packages/jest-circus/build/eventHandler.js:114:11)
       at afterAll (__tests__/asyncDefinition.test.js:13:5)
 
   ● Test suite failed to run
@@ -46,7 +46,7 @@ exports[`defining tests and hooks asynchronously throws 1`] = `
       20 | });
       21 |
 
-      at eventHandler (../../packages/jest-circus/build/eventHandler.js:190:11)
+      at eventHandler (../../packages/jest-circus/build/eventHandler.js:146:11)
       at test (__tests__/asyncDefinition.test.js:18:3)
 
   ● Test suite failed to run
@@ -60,6 +60,6 @@ exports[`defining tests and hooks asynchronously throws 1`] = `
       20 | });
       21 |
 
-      at eventHandler (../../packages/jest-circus/build/eventHandler.js:158:11)
+      at eventHandler (../../packages/jest-circus/build/eventHandler.js:114:11)
       at afterAll (__tests__/asyncDefinition.test.js:19:3)"
 `;

e2e/__tests__/global.test.ts

@@ -6,5 +6,5 @@
  */
 
 test('globals are properly defined', () => {
-  expect(global.Object).toBe(Object);
+  expect(globalThis.Object).toBe(Object);
 });

e2e/__tests__/json.test.ts

@@ -6,7 +6,7 @@
  */
 
 test('JSON is available in the global scope', () => {
-  expect(JSON).toBe(global.JSON);
+  expect(JSON).toBe(globalThis.JSON);
 });
 
 test('JSON.parse creates objects from within this context', () => {

e2e/__tests__/multiProjectRunner.test.ts

@@ -353,10 +353,10 @@ test('resolves projects and their <rootDir> properly', () => {
       testEnvironment: 'node',
     }),
     'project1/__tests__/test.test.js':
-      "test('project1', () => expect(global.project1).toBe(true))",
+      "test('project1', () => expect(globalThis.project1).toBe(true))",
     'project1/project1_setup.js': 'global.project1 = true;',
     'project2/__tests__/test.test.js':
-      "test('project2', () => expect(global.project2).toBe(true))",
+      "test('project2', () => expect(globalThis.project2).toBe(true))",
     'project2/project2.conf.json': JSON.stringify({
       name: 'project2',
       rootDir: '../', // root dir is set to the top level

e2e/__tests__/symbol.test.ts

@@ -6,7 +6,8 @@
  */
 
 test('Symbol deletion', () => {
-  global.Symbol = undefined;
+  // @ts-expect-error
+  globalThis.Symbol = undefined;
 
   expect({}).toEqual({});
 });

e2e/__tests__/testEnvironment.test.ts

@@ -50,7 +50,7 @@ it('handles missing `mocked` property', () => {
       jest.mocked();
 
       test('halla', () => {
-        expect(global.thing).toBe('nope');
+        expect(globalThis.thing).toBe('nope');
       });
     `,
   });

e2e/__tests__/transform.test.ts

@@ -114,7 +114,9 @@ describe('custom transformer', () => {
   it('preprocesses files', () => {
     const {json, stderr} = runWithJson(dir, ['--no-cache']);
     expect(stderr).toMatch(/FAIL/);
-    expect(stderr).toMatch(/instruments by setting.*global\.__INSTRUMENTED__/);
+    expect(stderr).toMatch(
+      /instruments by setting.*globalThis\.__INSTRUMENTED__/,
+    );
     expect(json.numTotalTests).toBe(2);
     expect(json.numPassedTests).toBe(1);
     expect(json.numFailedTests).toBe(1);

e2e/babel-plugin-jest-hoist/__tests__/integration.test.js

@@ -34,10 +34,10 @@ let e;
 })();
 
 jest.mock('../__test_modules__/f', () => {
-  if (!global.CALLS) {
-    global.CALLS = 0;
+  if (!globalThis.CALLS) {
+    globalThis.CALLS = 0;
   }
-  global.CALLS++;
+  globalThis.CALLS++;
 
   return {
     _isMock: true,
@@ -116,15 +116,15 @@ describe('babel-plugin-jest-hoist', () => {
   it('only executes the module factories once', () => {
     jest.resetModules();
 
-    global.CALLS = 0;
+    globalThis.CALLS = 0;
 
     require('../__test_modules__/f');
-    expect(global.CALLS).toEqual(1);
+    expect(globalThis.CALLS).toEqual(1);
 
     require('../__test_modules__/f');
-    expect(global.CALLS).toEqual(1);
+    expect(globalThis.CALLS).toEqual(1);
 
-    delete global.CALLS;
+    delete globalThis.CALLS;
   });
 
   it('does not hoist dontMock calls before imports', () => {

e2e/console-debugging/stdout-spy.js

@@ -8,19 +8,19 @@
 
 const originalStdoutWrite = process.stdout.write.bind(process.stdout);
 
-global.process.__stdoutWriteMock = global.process.__stdoutWriteMock || null;
+process.__stdoutWriteMock = process.__stdoutWriteMock || null;
 
 /*
   This is a terrible hack to ensure that we monkeyPath stdoutWrite before
   the jest reporter does...
 */
-if (!global.process.__stdoutWriteMock) {
-  global.process.__stdoutWriteMock = (...args) => {
-    global.process.__stdoutWriteMock.text = args[0];
+if (!process.__stdoutWriteMock) {
+  process.__stdoutWriteMock = (...args) => {
+    process.__stdoutWriteMock.text = args[0];
     originalStdoutWrite(...args);
   };
 
-  process.stdout.write = global.process.__stdoutWriteMock;
+  process.stdout.write = process.__stdoutWriteMock;
 }
 
-module.exports = global.process.__stdoutWriteMock;
+module.exports = process.__stdoutWriteMock;

e2e/coverage-report/__tests__/sum.test.js

@@ -10,7 +10,7 @@ jest.mock('../sumDependency.js'); // call mock explicitly
 
 const {sum} = require('../sum');
 
-if (!global.setup) {
+if (!globalThis.setup) {
   throw new Error('setup.js was not called.');
 }
 

e2e/coverage-report/setup.js

@@ -5,4 +5,4 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-global.setup = true;
+globalThis.setup = true;

e2e/env-test/__tests__/env.test.js

@@ -6,6 +6,6 @@
  */
 'use strict';
 
-console.log(global.window ? 'WINDOW' : 'NO WINDOW');
+console.log(globalThis.window ? 'WINDOW' : 'NO WINDOW');
 
 test('stub', () => expect(1).toBe(1));

e2e/expect-in-vm/__tests__/expect-in-vm.test.js

@@ -14,7 +14,7 @@ it('correctly expects RegExp inside a new VM context', () => {
     `(function(require, module, exports, __dirname, __filename, expect) {
   expect('ab12cd').toMatch(/ab12cd/);
 })`,
-    global,
+    globalThis,
   );
 
   const module = {

e2e/fake-promises/asap/fake-promises.js

@@ -7,4 +7,4 @@
 
 'use strict';
 
-global.Promise = require('promise');
+globalThis.Promise = require('promise');

e2e/fake-promises/immediate/fake-promises.js

@@ -7,4 +7,4 @@
 
 'use strict';
 
-global.Promise = require('promise/setimmediate');
+globalThis.Promise = require('promise/setimmediate');

e2e/override-globals/index.js

@@ -5,6 +5,6 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-global.Promise = function () {
+globalThis.Promise = function () {
   throw new Error('Booo');
 };

e2e/reset-modules/__tests__/resetModules.test.js

@@ -6,8 +6,7 @@
  */
 'use strict';
 
-// eslint-disable-next-line no-undef
-global.testObject = new Proxy(
+globalThis.testObject = new Proxy(
   {},
   {
     get: function getter(target, key) {

e2e/setup-files-after-env-config/__tests__/runnerPatch.test.js

@@ -8,6 +8,6 @@
 
 describe('setupFile', () => {
   it('patches jasmine in setup file', () => {
-    expect(global.describeDefined).toBe(true);
+    expect(globalThis.describeDefined).toBe(true);
   });
 });

e2e/setup-files-after-env-config/__tests__/test1.test.js

@@ -8,6 +8,6 @@
 
 describe('test', () => {
   it('has predefined global variable', () => {
-    expect(global.definedInSetupFile).toEqual(true);
+    expect(globalThis.definedInSetupFile).toEqual(true);
   });
 });

e2e/setup-files-after-env-config/__tests__/test2.test.js

@@ -8,6 +8,6 @@
 
 describe('test', () => {
   it('has predefined global variable', () => {
-    expect(global.definedInSetupFile).toEqual(true);
+    expect(globalThis.definedInSetupFile).toEqual(true);
   });
 });